Turn on 850 AM Friday morning, and you won’t hear WEEI’s long-running “Dennis and Callahan’’ program. In fact, had you turned it on Thursday, you got a loop recording reminding you to turn to 93.7 FM, which now is WEEI’s exclusive radio home. Instead, you’ll hear “Mike and Mike’’ broadcasting from Gillette Stadium beginning at 6 a.m., a savvy bit of synergy that coincides with the debut of ESPN Radio’s national daytime lineup taking over the 850 signal.
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